Adjustable drill holder



Aug. 4, 1959 F. H. SMITH ADJUSTABLE DRILL HOLDER Filed Sept. 15, 1955 2Sheets-Sheet 1 ill! I I 1 u H fkz'ofe cx A. J'M/ TH, INVENTOR.

g- 4, 1959 F. H. SMITH 2,898,118

ADJUSTABLE DRILL HOLDER Filed Sept. 15, 1955 2 Sheets-Sheet 2 lh gmlliiii fkEDE/P/cK h. JM/r/v,

INVENTOR.

ATTO/P/VEY.

United States Patent ADJUSTABLE DRILL HOLDER Frederick H. Smith, Dayton,Ohio Application September 15, 1955, Serial No. 534,469

4 Claims. (Cl. 279-16) The present invention relates to adjustableholders for drills, the same being adapted to provide means for holdingdrills to provide a means permitting self alignment of the drill withthe work, and is adapted for use in connection with both automatic andhand-operated screw machines.

The principal object of the present invention is the provision of adrill holder in which is provided means by which the device isself-aligning and with the same being provided with means formaintaining the self-aligned position.

A second object is the provision of a drill holder in which the aligningparts thereof provide floating means in the operation of the alignmentthereof.

Another object is the provision of a self-aligning and adjustable drillholder which is simple of operation and which is composed of a minimumnumber of parts.

Other particular objects and advantages of the invention will becomeapparent in the course of the following description, and that which isnew will be pointed out in the appended claims.

The preferred and most satisfactory manner of carrying out theprinciples and advantages of the invention in a practical, economical,and efiicient manner is shown in the accompanying drawings, in which:

Figure 1 is a side elevation of a drill holder embodying the features ofthe invention.

Figure 2 is a side elevation of the shank member of the device.

I Figure 3 is an end elevation of the shank member, taken from line 3-3of Figure 2.

Figure 4 is a detail section through the shank member, taken on line 4-4of Figure 2.

Figure 5 is a side elevation of the tool head member of the device.

Figure 6 is a detail forward end view of the tool head member, takenfrom line 66 of Figure 5.

Figure 7 is a detail rear end elevation of the tool head member, takenfrom line 7-7 of Figure 5.

Figure 8 is a detail section through the tool head, taken on line 88 ofFigure 7.

Figure 9 is an elevational side view of the drill bushing member whichis used in conjunction with the holder.

Figure 10 is an end elevation of the bushing, as taken from line 10-10of Figure 9;,

Figure 11 is a rear end elevation of the connecting collar member of thedevice.

Figure 12 is a detail vertical section through the connecting collarmember, taken on line 1212 of Figure 11.

Figure 13 shows an assembly of the parts and the position thereof afteralignment of the drill but before final tightening of the collar member,and with a portion of the collar being shown broken away.

Figure 14 is a detail similar to that shown in Figure 13, but showingthe parts thereof in final tightened condition.

Figure 15 is a detail section through the shank of the assembled device,taken on line 15--15 of Figure 1.

2,898,118 Patented Aug. 4, 1959 ICC Figure 16 shows portions of amachine and the adaptation of the device thereto and with the same beingin operative relation.

Figures 17 and 18 are face and edge views respectively of a wrenchespecially adapted for use in tightening and loosening the collar memberof the device.

Like characters of reference designate like parts throughout the severalviews of the drawings.

In order that the invention may be more fully understood andappreciated, I will now take up a detailed description thereof, in whichthe same will be more fully set forth.

Referring now to the drawings in detail, numerals 20 designate thecylindrical shank member of the device, with the shank portion thereofbeing tubular and having shank head 21 formed on the forward endthereof. A pair of diametrically-opposed lugs 22 are formed on theforward face of the head 21, and with the forward face surfaces 23 ofthe head being ground and polished to 'an extremely smooth surface forcontacting engagement with the rear surface of the tool head member. Asclearly seen in the drawings, the forward fiace surfaces 23 are radiallydisposed.

The tool head member is composed of a body 24 having threads 25 formedat the rear end thereof and with bore 26 being formed therein for thereception of the drill bushing member. A bore 27 is formed at the rearend of the body and is of smaller diameter than bore 26 and forming ashoulder 23 within the body and forming a stop limiting the distance ofinsertion of the bushing member therein. The rear surface of the body ismachined to provide slots 29 for receiving the lugs 22 of the shankmember. It will be noted by comparison that slots 29 are considerablygreater in width and in depth than lugs 22 which permits a loose fitbetween the lugs 22 and the slots 29. The rear end surfaces 30 of thetool head member is finely ground and polished to make frictionalcontact with the surfaces 23 of the shank head member. The rear endsurfaces 30, as clearly seen in the drawings, are radially disposed.

The .drill bushing is of a type similar to that shown and described inPatent No. 2,676,809, issued April 27, 1954, now reissued as Reissue No.24,348, and is composed of two identical halves 31 expandably securedtogether by means of a pair of spring rings 32 which provides africtional grip on the shank of a drill 33. The drill bushing isremovably secured in the tool head member 24 by means of set screw 34which is threaded through the wall of the head member, as more clearlyshown in Figures 5 and 6.

The connecting collar member 35 has threads 36 formed therein to matchthe threads 25 of the tool head member and has bore 37 formed throughthe rear wall thereof for the reception of the shank 20. It will benoted, by referring to Figure 15, that bore 37 is considerably largerthan shank 20 and permits movement of the collar in any direction in thealigning operation. A wrench-receiving channel 38 is formed around theperiphery of the collar, and blind holes 39 are provided about thecollar for the reception of the lug 40 of wrench 41.

Figure 16 shows the drill holder in position for operation in connectionwith a machine, with 42 being a part of the machine through which stock43 is fed and held therein by means of collet 44. The holders aresecured in a turret member 45 of the machine by means of screws 46.

In the use of the holder, the surfaces 23 of the shank head 21 areplaced against the surfaces 30 of the tool head member 24 with lugs 22being positioned in slots 29, after which collar 35 is brought intoposition over shank 20 and threaded onto threads 25 of the tool head.Bushing 31, together with drill 33, is positioned in the tool head-withthe rear end of the bushing being seated against shoulder 28 of the toolhead member, after which set screw 34 is tightened agains'tbushing 31. p

[In the operationof aligning the drill with the work, collar 35 istightenedslightly by hand while alignment is being established by theorbitary movement of the tool head with relation to the'shank. Withthecollar being tightened by hand the r'elationof the slots 29-assume theposition shown -in Figure 13 with relation to the lugs 22, after whichthe collar is tightened by means of wrench 41 with the wrench lug 40engaging one of the blind holes 39 of-the collarmember, and with thewing portionsof the wrench being engaged in channel 33. Upontightenirig'of-the collar by means of the wrench, the slots 29 assumethe position shown in Figure 14 withrelation to lugs-22. With threads 25and 36 being left hand, engagement of the drill with the work 43 causespressure in the direction of the arrow in'Figure l4'and causing theslots 29 to bear against lugs 22 as shown in Figure 14. With surfaces 23and 30 being ground and polished, the same provide frictional contacttherebetween with only a nominal pressure of the collar member.

' When realignment is desired, collar 35 is loosened slightly by meansof wrench 41 and, with the new alignment being completed, collar .35 isagain tightened to maintain the alignment. It will be noted that, 'dueto the design of the wrench, it is not necessary to remove the wrenchfrom the collar during the realignment operation.

It will be-noted'that holes 39 are blind in that they are not formedentirely" through the wall of the collar. The blind holes provide meanspreventing drilling chips or shavings from reaching the threads 25 and36.

'The drill holder herein shown and described is an improvement'over theSelf-Aligning Tool Holder shown in. my pending application, Serial No.454,705, filed September 8, 1954 now Patent No. 2,768,832 in that themembers 20 and 24 are held in frictional contact by reason of surfaces23 and 30 respectively being ground and highly polished.

It is desired that it be understood that the presently preferredembodimentof the invention is shown and described herein, but'that thesame is not to be limited to the specific construction herein shown anddescribed, but that minor changes may be made therein insofar as thechanges may fall within the scope of the appended claims.

Having now fully shown and described the invention,

4 what I claim and desire to secure by Letters Patent of theUnited-States, is:

1. An adjustable drill holder comprising a tool head adapted to receivea drill bushing, the rear surface of the tool head having radiallydisposed slots, the rear end of the tool head having radially disposedfinely ground and polished surfaces, a shank member, a head portionformed on one end of the shankmember, said head portion having radiallydisposed lugs positioned in the slots of the toolhead, 'said' lugshaving less width and depth than the slots, the forward radiallydisposed surfaces of the head portion being ground and polished andabutting the rear end radially disposed polished surfaces of the toolhead member, and an adjustable collar securing the tool head withrelation to the head portion of the shank, said lugs preventing rotationof the tool head with respect to the shank.

2. An adjustable drill holder according to claim 1, wherein the slots onthe rear surface of the tool head are diametrically disposed and whereinthe lugs on the head portion of the shank member are diametricallydisposed.

3. An' adjustable drill holder according to claim 1, wherein the outerperipheral portion of the head is threaded and wherein the collarthreadedly engages the threaded portion of the head member to adjustablysecure the forward face of the shank head in frictional engagement withthe rear surface of the tool head, said collar having a wrench receivingchannel formed therearound and blind lug receiving holes being formedaroun the collar in the wrench receiving channel.

4. An adjustable drill holder according to claim 1, wherein the toolhead is provided with left handed threads and the collar fits over thehead portion of the shank member and being provided with internalthreads engaging the left handed threads of the tool head.

References Cited in the file of this patent UNITED STATES PATENTS687,563 Hendrick Nov. 26, 1901 1,359,103 Randa Nov. 16, 1920 1,369,491Straehle Feb. 22, 1921 1,424,535 Watts Aug. 1, 1922 2,004,077 McCartneyet a1. June 4, 1935 2,327,897 Howard Aug. 24, 1943 2,399,808 Jones May7, 1946 2,498,148 Berritta Feb. 21, 1950 2,767,564 Green Oct. 23, 1956

